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can see redhat window

hi
I'm working on oracle apps Database Oracle 9.2.0.6the version is 11.5.10.2
using by linux server RHEL4
the problem is just two days before it was work and i can login to application
but today i can't so when i want to login to server
is give me black screen and ask me about
applprod login
passwsord
I put both then give me
you have new mail
but i can't see that mail
also i cant see it from root
if i type any command is give me
no such directory
or
no command found
i tried to restart also i cant
so what i can do
thanks
emad

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Hi,
What happened from two days ago ?
bad shutdown, power failure ?
can You see prompt ?
execute "echo $PATH"
output must be similar to
/bin:/usr/bin:/usr/local/bin..................
if not, the content of PATH is damaged..
execute "rpm -Va" and check integrity of packages.

Sounds like your default login is text rather than graphical. Try typing
"startx" and see if that brings up the desktop.
If you want to read your mail, you can simply issue the "mail" command.
I'd recommend looking at the man page (man mail) first though.

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